ET SCAN Grendel-Scan Web Application Security Scan Detected

Query · suricata

flow:to_server,established;
threshold:type threshold, track by_dst, count 20, seconds 40;
http.method;
content:"GET";
http.uri;
content:"/random"; nocase; fast_pattern;
pcre:"/\x2Frandom\w+?\x2E(?:c(?:f[cm]|gi)|ht(?:ml?|r)|(?:ws|x)dl|a(?:sp|xd)|p(?:hp3|l)|bat|swf|vbs|do)/i";
Raw source ET SCAN Grendel-Scan Web Application Security Scan Detected · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (
    msg:"ET SCAN Grendel-Scan Web Application Security Scan Detected";
    flow:to_server,established;
    threshold:type threshold, track by_dst, count 20, seconds 40;
    http.method;
    content:"GET";
    http.uri;
    content:"/random"; nocase; fast_pattern;
    pcre:"/\x2Frandom\w+?\x2E(?:c(?:f[cm]|gi)|ht(?:ml?|r)|(?:ws|x)dl|a(?:sp|xd)|p(?:hp3|l)|bat|swf|vbs|do)/i";
    reference:url,www.grendel-scan.com;
    classtype:attempted-recon;
    sid:2009481; rev:10;
    metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, updated_at 2020_09_29;
)

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